Starting March 16, 2019, Salesforce will be automatically turning on the Salesforce’s Remove Instance Names from URLs for Visualforce, Community Builder, Site.com Studio, and Content Files Critical Update. If your org has My Domain enabled and you are using Callback or Redirect URLs in either your Skuid pages or in standard Salesforce (such as in Salesforce buttons), this could potentially impact you! In addition to Salesforce’s documentation above, please see our Callback URLs/Redirect URLs documentation for more information. The troubleshooting section contains our recommendations on what to look for so you can test this out while it is still possible to activate and deactivate this critical update in your org.